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I don't think what I'm going to say really explains anything, but the way I interpret the schematics, having a resistor populated would make it a 0. Because they each have 4.7k pullups pulling the line up to a logical 1, and populating a 47 ohm resistor to ground will drop it down to a logical...

You’re welcome! If you did see a comment by BMOW about that, I wonder if he was referring to something bbraun said at the bottom of that last link I posted, where if the ‘cicn’ ends up too big, you end up having to relocate things. Seems like that could get a little tricky.

I'm the author of the software and firmware for the ROM SIMM programmer. Unfortunately I have never found the time to make a tool that does a bunch of commonly-wanted ROM hacks like custom icons and chimes, but I think there are a few options: The 32x32 pixel Happy Mac icon is at offset 0x17F2...

Turns out this hard drive also definitely came from a Performa 550. Luckily the owner had run MacCheck and saved a report, which said: 80 is gestaltMacLC550. Too bad it had been reformatted in 2000, I could have learned some interesting stuff from this one. Yep! It was definitely not...

Nice! I wonder if Apple Backup is still present on it. The easiest way to dump the HDD is to use a ZuluSCSI or BlueSCSI V2 with initiator mode, although with someone who's not tech savvy I realize that can be tricky. Ahh yeah, definitely for a 630 then. Mystery solved! I bought a 160 MB Apple...

Thanks for taking a photo! Ah yes, I've heard of Internal HD Format. My understanding is that it only works with Macs that have IDE drives: https://machut.net/files/manuals/macintosh_performa/0306379PerformaHDupdt.PDF I'm thinking maybe that disk actually came with a Performa 630 series...

Thanks! As soon as @Dandu mentioned that this existed, I knew I just had to find it. I didn't want it to be lost forever. And as these hard drives age and go bad due to gooey rubber or whatever else, it's only going to get harder and harder to find working ones. So I knew time was of the...

I'm extremely curious about that as well. If anyone has a 575 that has never been formatted and has the ability to dump the hard drive with a ZuluSCSI or BlueSCSI in initiator mode, I'd love to take a look. By the way, I'm still working on sharing the partition content with everybody. I just...

Thanks! I've been on a bit of a kick about seeing original Performa stuff, and I'm very curious!

If you have an earlier disk, I'd love to see the contents of it if you'd be willing to share!

Ah yes, are you thinking of the Utilities disk? I still have this one, which came with a caddy-loading Performa 550. It doesn't have special names for those two programs, but it's definitely a Performa-specific thing. Here's a screenshot of booting from it:

I also bought a copy of the Dinosaur Safari CD that Apple mentioned in the second technote I linked, and used MAME to reproduce the bug they were talking about. As soon as you launch it, the machine reboots and up pops this message. I'm interested in looking deeper to understand how/why that...

Yeah, I was going to point out the CayMac SIMM. I think I've heard of someone else making something compatible as well, but I can't remember. To be fair, I think people have found that older SIMM designs happen to work in the 610/650 despite not disabling the onboard ROMs like the newer design...

A kind soul on Reddit let me borrow a hard drive out of a Performa 550. After I got it working (which will probably be a video all on its own for future reference for people with old Conner hard drives that don't work) and dumped it, look what I found:

Thanks! That’s a fantastic reference!

I guess I should point out that I posted a blog about this discovery today! Thanks! Is there some kind of reference of all of the steppings, revisions, etc.? I have a IIci...definitely could be worth testing! Thank you! I could have sworn I read somewhere that rev B still has the same ROM...

Thank you all! Very fun stuff. Interestingly, the early Classic II that I bought has EPROMs with stickers for the Apple part numbers instead of mask ROMs. Not that it would disprove your mask ROM theory, but I found it interesting nonetheless. I still think it was a mistake. It wasn't...

That is really, really cool. Congrats on finally finding an unmodified one, and incredible that it still has a working logic board! I can totally understand the thought process behind not replacing any of the components, especially since you already have another one that's recapped and...

Thanks! So that might be a good one for future Classic II troubleshooters, make sure that pin isn't shorted to ground. No joke, it's crazy how unnecessarily close to the pad that trace runs. Although in fairness, this wouldn't have happened if I had put caps that matched what the factory put...

I figured it out! The Classic II logic board lives, and successfully booted from ZuluSCSI. Didn't have to remove any chips. I thought the Egret looked pretty clean and I had already absolutely doused it with 99% IPA, dripped it through underneath, and scrubbed well with a toothbrush earlier, so...